Power supply grounding fault protection circuit

ABSTRACT

The present disclosure relates to a power supply grounding fault protection circuit. A power supply grounding fault protection circuit may include a power supply circuit, a leakage grounding detection circuit, a signal amplifying and shaping circuit, a microcontroller control circuit, a power supply detection and indicator circuit, a tripping mechanism control circuit, a reverse grounding detection and execution circuit, a wireless network circuit, and an automatic resetting circuit. The practice of the present disclosure may permit a user to reset the grounding fault circuit interrupter remotely after a leaking fault of a circuit is eliminated.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and incorporates herein by referencein its entirety Chinese Application No. 201510930712.8, filed on Dec.15, 2015.

TECHNICAL FIELD

The present disclosure relates to a power supply grounding faultprotection circuit.

BACKGROUND

The ground fault circuit interrupter (GFCI) is a leakage protectionproduct widely used in countries/regions such as the United States,Canada, North America, and South America. A GFCI may provide power toloads through jacks in its upper cover; it may power the loads through adelivery connection assembly, while reducing electrical safety risks.

Chinese Patent Application No. CN104332946A, published on Feb. 4, 2015,and incorporated herein by reference in its entirety, discloses a “powersupply grounding fault protection circuit and grounding fault circuitinterrupter.” The power supply grounding fault protection circuitcomprises a power supply circuit, a leakage grounding detection circuit,a signal amplifying and shaping circuit, a microcontroller controlcircuit, a power supply detection and indicator circuit, a trippingmechanism control circuit, and a reverse connection detection andexecution circuit. To implement leakage protection for the the powersupply, the electromagnetic tripping mechanism is configured to actresponsively to the leakage grounding detection circuit.

The above-described power supply grounding fault protection circuit,through providing a reverse connection detection and execution circuitand a simulation leakage circuit, reduces safety risks that may becaused by, for example, incorrect GFCI installation. It may also providean automatic leakage detection function during operation. In a workingstate, when the grounding fault circuit interrupter fails, for exampledue to current leakage, a user may be warned of the failure so that thedevice may be timely replaced. This may prevent circuit safety riskscaused by delayed observance of GFCI failure, and thus significantlyimproves safety protection function of the GFCI.

Nevertheless, the existing power supply grounding fault protectioncircuit has the following drawbacks: When a GFCI has been tripped andafter the leakage fault of the circuit is eliminated, the GFCI must bemanually reset to resume operation. Thus, when an operator is away fromthe GFCI and is not able to manually reset the GFCI, it may be difficultto place the GFCI back into its normal working state.

SUMMARY

A technical problem to be solved by the present disclosure is to providea power supply grounding fault protection circuit that overcomes thedrawbacks of the existing grounding fault protection circuits thatrequire resetting be done manually and that do not provide remoteresetting capabilities.

In one example, a power supply grounding fault protection circuit isprovided. It may include a power supply circuit, a leakage groundingdetection circuit, a signal amplifying and shaping circuit, amicrocontroller control circuit, a power supply detection and indicatorcircuit, a tripping mechanism control circuit, a reverse groundingdetection and execution circuit, a wireless network circuit, and anautomatic resetting circuit.

In another example, the leakage grounding detection circuit includes aleakage detection circuit and a grounding detection circuit, which maydetect leakage failure and grounding failure, respectively. The signalamplifying and shaping circuit may include a leakage detection signalamplifying circuit and a signal shaping circuit, which may be connectedto each other and may carry out amplifying and shaping on a leakagedetection signal. The microcontroller control circuit may carry outpower-on self-test and reset for the power supply grounding faultprotection circuit. The power supply detection and indicator circuit mayinclude a power supply detection circuit and an indicator circuit, whichmay be connected to each other and carry out detection and displaying ofa power status. The tripping mechanism control circuit may include areset switch, which may be provided on a live line and a neutral line ofthe ground fault protection circuit, and a control circuit that maycontrol the reset switch. The reverse grounding detection and executioncircuit may include a reverse connection detection control circuit and adetection and execution circuit, which may be connected to each otherand may carry out detecting of a reverse connection of the ground faultprotection circuit in a reset state and in a tripped state. The wirelessnetwork circuit may carry out sending and receiving of wireless signalsof the power supply grounding fault protection circuit and may berespectively connected to the power supply circuit and themicrocontroller control circuit. The automatic resetting circuit may beconnected to the microcontroller control circuit and may carry outcontrolling and driving of resetting actions of the reset switch of thetripping mechanism control circuit.

In yet another example, the power supply circuit may include a powersupply filter circuit, a first rectifier circuit, a first filter andregulator circuit, and a second filter and regulator circuit. The firstfilter and regulator circuit may be connected to the leakage groundingdetection circuit. The second filter and regulator circuit may beconnected to the signal amplifying and shaping circuit and themicrocontroller control circuit. The leakage grounding detectioncircuit, the signal amplifying and shaping circuit, and themicrocontroller control circuit may be connected in sequence. Themicrocontroller control circuit may be connected to the power supplydetection and indicator circuit, the tripping mechanism control circuit,and the reverse connection detection and execution circuit.

In yet another example, the power supply filter circuit may be connectedto an input terminal of the live line. A first input terminal and asecond input terminal of the first rectifier circuit may be respectivelyconnected to an input terminal of the neutral line and an outputterminal of the power supply filter circuit. A first pin of the firstrectifier circuit may be grounded. A second pin of the first rectifiercircuit may connected to the both the first filter and regulator circuitand the second filter and regulator circuit. The reset switch may bepositioned on the live line and the neutral line after the groundingdetection circuit.

In yet another example, the microcontroller control circuit may includea microcontroller, a first capacitor, and a reset filter circuit. Thereset filter circuit may include a reset IC and a second capacitor. Afirst pin of the reset IC may be connected to a VCC of the ground faultprotection circuit, a second pin of the reset IC may be connected to areset terminal of the microcontroller, and a third pin of the reset ICmay be grounded. The second capacitor may be connected between thesecond and third pins of the reset IC. The first capacitor may beconnected between a power supply terminal of the microcontroller and aground. The power supply terminal of the microcontroller may beconnected to the VCC. A ground terminal of the microcontroller may begrounded.

The leakage detection signal amplifying circuit may include a leakagesignal processing IC, a third capacitor, a first resistor, and a fourthcapacitor. The first resistor and the fourth capacitor may be connectedin series between the leakage detection circuit and the groundingdetection circuit. The first resistor may be connected between a firstpin and a second pin of the leakage signal processing IC.

The signal shaping circuit may include an operation amplifier, a fifthcapacitor, a sixth capacitor, a seventh capacitor, a second resistor, athird resistor, a fourth resistor, an eighth capacitor, a ninthcapacitor, a tenth capacitor, and a fifth resistor. The fifth, sixth andseventh capacitors may be connected in parallel between the ground and athird pin of the leakage signal processing IC. The second resistor maybe connected between a fourth pin of the leakage signal processing ICand a first pin of the operation amplifier. The third and fourthresistors may be connected in series between the VCC and the ground. Aconnection point of the third and fourth resistors may be connected to asecond pin of the operation amplifier. The eighth capacitor may beconnected between ground and the first pin of the operation amplifier. Apower supply terminal and a ground terminal of the operation amplifiermay be respectively connected to the VCC and the ground. The ninthcapacitor may be connected between the power supply terminal of theoperation amplifier and the ground. The fifth resistor and the tenthcapacitor may be disposed in series between the VCC and the ground. Aconnection point of the fifth resistor and the tenth capacitor may beconnected to a third pin of the operation amplifier. The third pin ofthe operation amplifier may be connected to a control signal inputterminal of the microcontroller.

In yet another example, the signal shaping circuit, the leakage signalprocessing IC, and the microcontroller of the microcontroller circuitmay be contained within a single microcontroller control signalamplifying and shaping circuit chip.

In yet another example,the power supply filter circuit may include aninductor coil. The first filter and regulator circuit may include asixth resistor, an eleventh capacitor, and an internal regulator circuitof a first pin of a leakage signal processing IC. The inductor coil maybe connected between the input terminal of the live line and the secondinput terminal of the first rectifier circuit. The sixth resistor may beconnected between the second pin of the first rectifier circuit and thefifth pin of the leakage signal processing IC. The eleventh capacitormay be connected between the fifth pin of the leakage signal processingIC and the ground.

The second filter and regulator circuit may include a seventh resistor,a stabilivolt, a twelfth capacitor, a thirteenth capacitor, a fourteenthcapacitor, a fifteenth capacitor, a power supply IC, an sixteenthcapacitor, a seventeenth capacitor, a eighteenth capacitor, and anineteenth capacitor. The seventh resistor may be connected between thesecond pin of the first rectifier circuit and a first pin of the powersupply IC. A positive electrode of the stabilivolt may be grounded. Anegative electrode of the stabilivolt may be connected to first pin ofthe power supply IC. The thirteenth, fourteenth, and fifteenthcapacitors may be connected in parallel between the first pin of powersupply IC and the ground. The sixteenth, seventeenth, eighteenth, andnineteenth capacitors may be connected in parallel between a second pinof the power supply IC and the ground. The second pin of the powersupply IC may be connected to the VCC. A third pin of the power supplyIC may be grounded.

The leakage detection circuit may include a first current couplinginduction coil and a twentieth capacitor. The twentieth capacitor may beconnected between a first terminal and a second terminal of the firstcurrent coupling induction coil. The first and second terminals of thefirst current coupling induction coil may be connected to a sixth and aseventh pin of the leakage signal processing IC, respectively. The liveand neutral lines may pass through the first current coupling inductioncoil.

The grounding detection circuit may include a second current couplinginduction coil and a twenty-first capacitor. The twenty first capacitormay be connected to a first terminal and a second terminal of the secondcurrent coupling induction coil. The first and second terminals of thesecond current coupling induction coil may be grounded and connected,respectively, via the fourth capacitor to the second pin of leakagesignal processing IC, respectively. The live and neutral lines may passthrough the second current coupling induction coil.

The power supply detection circuit may include the first rectifiercircuit, the sixth resistor, the internal regulator circuit, theeleventh capacitor, an eighth resistor, a ninth resistor, atwenty-second capacitor, and the microcontroller. The sixth resistor maybe connected between the second pin of the first rectifier circuit andthe fifth pin of the leakage signal processing IC. The third capacitormay be connected between the fifth pin of the leakage signal processingIC and the ground. The eighth resistor may be connected between thefifth pin of the leakage signal processing IC and the ninth resistor,which may be grounded. A connection point of the eighth and ninthresistors may be connected to a detection terminal of themicrocontroller. The twenty-second capacitor may be connected betweenthe ground and the detection terminal of the microcontroller.

The indicator circuit may include a normal signal output terminal and afault signal output terminal of the microcontroller, a tenth resistor,an eleventh resistor, a red LED, and a green LED. The tenth resistor maybe connected between the fault signal output terminal of themicrocontroller and a negative electrode of the red LED. The eleventhresistor may be connected between the normal signal output terminal ofthe microcontroller and a negative electrode of the green LED. Apositive electrode of the red LED and a positive electrode of the greenLED may be connected to the VCC.

The control circuit of the tripping mechanism control circuit mayinclude the microcontroller, a twenty-third capacitor, a twelfthresistor, a first one-way silicon controlled rectifier, a twenty-fourthcapacitor, a thirteenth resistor, and a relay that may interface withthe inductor coil. The twenty-third capacitor may be connected between atriggering signal terminal of the microcontroller and the ground. Thetwelfth resistor may be connected between the triggering signal terminalof the microcontroller and a control electrode of the first one-waysilicon controlled rectifier. An anode of the first one-way siliconcontrolled rectifier may be connected to a connection point where theinductor coil may be connected to the second input terminal of the firstrectifier circuit. A cathode of the first one-way silicon controlledrectifier may be grounded. The twenty-fourth capacitor and thethirteenth resistor may be connected in series between the anode of thefirst one-way silicon controlled rectifier and the ground. The relay maydrive the reset switch through a mechanical link.

The reverse connection detection control circuit may include themicrocontroller, a twenty-fifth capacitor, a fourteenth resistor, aheavy and light current isolation optocoupler, a fifteenth resistor, asixteenth resistor, and a two-way silicon controlled rectifier. Thetwenty-fifth capacitor may be connected between an SCR triggeringterminal of the microcontroller and the ground. The fourteenth resistormay be connected between the SCR triggering terminal of themicrocontroller and a triggering control terminal of the heavy and lightcurrent isolation optocoupler. A power supply terminal of the heavy andlight current isolation optocoupler may be connected to the VCC. Thefifteenth resistor may be connected between a second T2 electrode of thetwo-way silicon controlled rectifier and a load output terminal of thelive line. The sixteenth resistor may be connected between a controlelectrode and a first T2 electrode of the two-way silicon controlledrectifier. The control electrode of the two-way silicon controlledrectifier may be connected to a second output terminal of the heavy andlight current isolation optocoupler. A first output terminal of theheavy and light current isolation optocoupler may be connected to theload output terminal of the live line.

The detection and execution circuit may include a twenty-sixthcapacitor, a twenty-seventh capacitor, a normally-closed contact, anormally-open contact, a seventeenth resistor, a normally-closed switch,and a reverse relay. The twenty-sixth capacitor and the twenty-seventhcapacitor may be connected in series. The first output terminal of theheavy and light current isolation optocoupler may be connected to afirst terminal of the twenty-seventh capacitor, a first terminal of thenormally-closed contact, and a first terminal of the normally-opencontact. The second output terminal of the heavy and light currentisolation optocoupler may be connected to the twenty-sixth capacitor, asecond terminal of the normally-open contact, and a second terminal ofthe normally-closed contact through the sixteenth resistor. Theseventeenth resistor may be connected between a connection point betweenthe twenty-sixth and twenty-seventh capacitors and a load outputterminal of the neutral line. The normally-closed switch may be providedon the live and neutral lines between the load output terminals of thelive and neutral lines and the reset switch. The normally-closed switchmay be linked with the normally-open contact. A first terminal of thereverse relay may be connected to the second output terminal of theheavy and light current isolation optocoupler via the sixteenthresistor. A first terminal of the reverse relay may be connected to theload output terminal of the neutral line. The reverse relay may drivethe normally-closed switch through a mechanical link.

In yet another example, the wireless network circuit may include awireless network IC, a WIFI reset switch, a first wireless resetresistor, a second wireless reset resistor, a wireless reset filterresistor, a wireless reset filter capacitor, and a wireless enablingresistor. The wireless network IC may have WIFI functionality. Thewireless reset filter resistor may be connected between ground and afirst pin of the wireless network IC. The wireless reset filtercapacitor may be connected between ground and a second pin of thewireless network IC. The first wireless reset resistor may be connectedbetween a VCC of the ground fault protection circuit and the second pinof the wireless network IC. The wireless enabling resistor may beconnected between the VCC and a third pin of the wireless network IC.The second wireless reset resistor may connected between the VCC and afourth pin of the wireless network IC. The WIFI reset switch may beconnected between the ground and the fourth pin of the wireless networkIC. A fifth pin of the wireless network IC may be connected to first pinof a microcontroller of the microcontroller control circuit. A sixth pinof the wireless network IC may be connected to second pin of themicrocontroller. The fourth pin of the wireless network IC may beconnected to third pin of the microcontroller. The second pin of thewireless network IC may be connected to a fourth pin of themicrocontroller.

In yet another example, the automatic resetting circuit may include anautomatic resetting iron core, a surge absorption filter capacitor, asurge absorption resistor, and an automatic resetting driving circuit.The automatic resetting driving circuit may include a silicon controlledrectifier and a driving resistor. A first terminal of the automaticresetting iron core may be connected to an input terminal of a live lineof the power supply grounding fault protection circuit, and a secondterminal of the automatic resetting iron core may be connected to afirst pin of the silicon controlled rectifier through the surgeabsorption filter capacitor and the surge adsorption resistor, which maybe connected in series. A second pin of the silicon controlled rectifiermay be connected to the automatic resetting iron core. The first pin ofthe silicon controlled rectifier five may be grounded. The drivingresistor may be connected to a fifth pin of a microcontroller of themicrocontroller control circuit and a third pin of the siliconcontrolled rectifier. The fifth pin of the microcontroller may begrounded via a filter capacitor. The microcontroller control circuit maybe configured to carry out automatic resetting by receiving wirelesscontrol signals through the wireless network circuit and by controllingthe resetting iron core through the automatic resetting circuit.

In yet another example, the power supply grounding fault protectioncircuit may further include a simulation leakage circuit connected tothe microcontroller control circuit and the leakage grounding detectioncircuit.

In yet another example, the simulation leakage circuit may include themicrocontroller, a twenty-eighth capacitor, an eighteenth resistor, asecond one-way silicon controlled rectifier, and a nineteenth resistor.The twenty-eighth capacitor may be connected between ground and asimulation signal triggering terminal of the microcontroller. Theeighteenth resistor may be connected between the simulation signaltriggering terminal of the microcontroller and a control electrode ofthe second one-way silicon controlled rectifier. The second one-waysilicon controlled rectifier and the nineteenth resistor may beconnected in series between the live line and the ground. The nineteenthresistor may be connected between an anode of the second one-way siliconcontrolled rectifier and the live line next to the reset switch.

Compared with the prior art, the disclosed power supply grounding faultprotection circuit may have the following beneficial effects:

First, providing a wireless network circuit and an automatic resettingcircuit enables remote control of the GFCI. That is, a user may remotelyreceive the working status of the GFCI. And when a leaking fault of acircuit is eliminated, the user may reset the grounding fault circuitinterrupter remotely.

Second, it is possible to remind the user of and to display the workingstatus of the GFCI, thereby improving electricity safety for in variousenvironments, including for families.

Third, the circuit is simple and easy to implement.

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory onlyand are not restrictive of the invention, as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated into and constitute apart of this specification, illustrate embodiments of the presentdisclosure and together with the description, serve to explain theprinciples of the disclosure.

FIG. 1 is a block diagram of an embodiment of a power supply groundingfault protection circuit of the present disclosure.

FIG. 2 is a block diagram of another embodiment of a power supplygrounding fault protection circuit of the present disclosure.

FIG. 3 is a block diagram of yet another embodiment of a power supplygrounding fault protection circuit of the present disclosure.

FIG. 4 is a first circuit diagram of a portion of an embodiment of aground fault protection circuit of the present disclosure.

FIG. 5 is a second circuit diagram of a portion of an embodiment of aground fault protection circuit of FIG. 4.

FIG. 6 is a third circuit diagram of a portion of an embodiment of aground fault protection circuit of FIG. 4.

FIG. 7 is a fourth circuit diagram of a portion of an embodiment of aground fault protection circuit of FIG. 4.

FIG. 8 is a fifth circuit diagram of a portion of an embodiment of aground fault protection circuit of FIG. 4.

DETAILED DESCRIPTION

References will now be made in detail to the present exemplaryembodiments, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers will be usedthroughout the drawings to refer to the same or like parts. While thedescription includes exemplary embodiments, other embodiments arepossible, and changes may be made to the embodiments described withoutdeparting from the spirit and scope of the invention. The followingdetailed description does not limit the invention. Instead, the scope ofthe invention is defined by the appended claims and their equivalents.

In the specification, the circuit symbols in the drawings are namedaccording to the following convention: “circuit symbol_drawing number.”For example, a rectifier circuit U27 in FIG. 4 is named U27_4.

As shown in FIG. 1, the power supply grounding fault protection circuitof the present disclosure may comprise a power supply circuit 90, aleakage grounding detection circuit 20, a signal amplifying and shapingcircuit 10-2, a microcontroller control circuit 10-1, a power supplydetection and indicator circuit 60, a tripping mechanism control circuit80, a manual detection circuit 20 a, a simulation leakage circuit 50, areverse connection detection and execution circuit 70, a wirelessnetwork circuit 40, and an automatic resetting circuit 30.

The leakage grounding detection circuit 20 may comprise a leakagedetection circuit and a grounding detection circuit, which detectleakage failure and grounding failure, respectively.

The signal amplifying and shaping circuit 10-2 may comprise a leakagedetection signal amplifying circuit and a signal shaping circuit, whichmay be connected to each other and carry out amplifying and shaping on aleakage detection signal.

The microcontroller control circuit may carry out power-on self-test andresetting for the power supply grounding fault protection circuit.

The power supply detection and indicator circuit 60 may comprise a powersupply detection circuit and an indicator circuit, which may beconnected to each other and carry out detection and displaying of thepower supply status.

The tripping mechanism control circuit 80 may comprise comprises a resetswitch provided on the live line L and the neutral line N of the powersupply grounding fault protection circuit and its control circuit. Theposition where the reset switch is provided on the live line L and theneutral line N of the power supply grounding fault protection circuitmay be located after the grounding detection circuit. The controlcircuit may carry out controlling of the reset switch.

The reverse connection detection and execution circuit 70 may comprise areverse connection detection control circuit and a detection andexecution circuit, which may be connected to each other and carry outreverse connection detection when the power supply grounding faultprotection circuit is in a reset state or a tripped state.

The wireless network circuit 40 may be respectively connected to thepower supply circuit 90 and the microcontroller control circuit 10-1, tocarry out sending and receiving of wireless signals of the power supplygrounding fault protection circuit.

The automatic resetting circuit 30 may be connected to themicrocontroller control circuit 10-1 and may carry out controlling anddriving of resetting actions of the reset switch of the trippingmechanism control circuit.

The power supply circuit 90 may comprise a power supply filter circuit,a rectifier circuit U27_4, a first filter and regulator circuit, and asecond filter and regulator circuit. The power supply filter circuit maybe connected to an input terminal of live line L receiving municipalelectricity. The input terminals of the rectifier circuit U27_4 may berespectively connected to an input terminal of the neutral linereceiving municipal electricity and an output terminal of the filtercircuit A. The output terminal pin 4 of the rectifier circuit U27_4 maybe grounded, and its output terminal pin 3 may be connected to the firstfilter and regulator circuit and the second filter and regulatorcircuit, respectively.

The first filter and regulator circuit of the power supply circuit 90may be connected to the leakage grounding detection circuit 20. Thesecond filter and regulator circuit of the power supply circuit 90 maybe connected to the signal amplifying and shaping circuit 10-2, themicrocontroller control circuit 10-1, and the wireless network circuit40. The leakage grounding detection circuit 20, the signal amplifyingand shaping circuit 10-2, and the microcontroller control circuit 10-1may be connected in sequence. The manual detection circuit 40 may beconnected to the leakage grounding detection circuit 20. Themicrocontroller control circuit 10-1 may be respectively connected tothe simulation leakage circuit 50, the power supply detection andindicator circuit 60, the tripping mechanism control circuit 80, and thereverse connection detection and execution circuit 70. The simulationleakage circuit 50 may be connected to the leakage grounding detectioncircuit 20. The manual detection circuit 20 a may be connected to theleakage grounding detection circuit 20.

FIGS. 4 to 8 depict an embodiment of the present disclosure.

As shown in FIGS. 6 and 8, the microcontroller control circuit 10-1 maycomprise a microcontroller MCU_8, a filter capacitor C14_6, and a resetfilter circuit. The reset filter circuit comprises a reset IC U3_6, anda filter capacitor C12_6.

The leakage detection signal amplifying circuit of the signal amplifyingand shaping circuit 10-2 may comprise a leakage signal processing ICU5_8, a coupling capacitor C30_4, a negative feedback resistor R41_4,and a coupling capacitor C31_4.

The signal shaping circuit of the signal amplifying and shaping circuit10-2 may comprise a operation amplifier U1A_8, a filter capacitor C18_8,a filter capacitor C19_8, a filter capacitor C20_8, a current limitingresistor R14_8, a filter capacitor C21_8, a voltage divider resistorR13_8, a voltage divider resistor R4_8, a filter capacitor C22_8, afilter capacitor C23_8, and a voltage divider resistor R15_8.

As shown, the signal shaping circuit of the signal amplifying andshaping circuit 10-2, the leakage signal processing ICU5_8 of theleakage detection signal amplifying circuit of the signal amplifying andshaping circuit 10-2, and MCU_8 of the microcontroller control circuit10-1 may be contained within a single-chip microcontroller controlsignal amplifying and shaping circuit chip IC U4_6, which is depicted aselement 10 in FIG. 2. In other embodiments, the signal amplifying andshaping circuit 10-2 and the microcontroller control circuit 10-1 may bebe disposed separately, for example as multiple individual IC chips orthe like.

Pin 3 of the reset IC U3_6 may be connected to a VCC terminal of thepower supply grounding fault protection circuit, pin 2 of the resetICU3_6 may be connected to a reset terminal (pin 4) of the MCU_8 (pin 6of IC U4_6), and pin 1 may be grounded. The filter capacitor C12_6 maybe respectively connected to pin 1 and pin 2 of the reset ICU3 6. Oneterminal of the filter capacitor C14_6 may be connected to a powersupply terminal (pin 1) of the MCU_8 (pin 20 of ICU4_6), and the otherterminal may be grounded. The power supply terminal (pin 1) of the MCU_8may be connected to the VCC terminal of the power supply grounding faultprotection circuit; its ground terminal 16 may be grounded.

The coupling capacitor C30_4, the negative feedback resistor R41_4, andthe coupling capacitor C31_4 of the leakage detection signal amplifyingcircuit of the signal amplifying and shaping circuit 10-2 may besequentially connected in series between the leakage detection circuitand the grounding detection circuit of the leakage grounding detectioncircuit 20 (between the capacitor C6_4 and the capacitor C3_4 as shownin FIG. 4). Two terminals of the negative feedback resistor R41_4 may berespectively connected to pin 1 and pin 7 of the leakage signalprocessing ICU5_8 (pin 1 and pin 17 of IC U4_6).

Filter capacitor C18_8, filter capacitor C19_8, and filter capacitorC20_8 of the signal shaping circuit of the signal amplifying and shapingcircuit 10-2 may be connected in parallel at two terminals. One of thetwo terminals may be grounded, and the other of the two terminals may beconnected to pin 5 of the leakage signal processing IC U5_8. Oneterminal of current limiting resistor R14_8 maybe also be connected topin 5 of the leakage signal processing IC U5_8, and the other terminalmay be connected to pin 3 of the operation amplifier U1A_8. One terminalof filter capacitor C21_8 may be connected to pin 3 of the operationamplifier U1A_8, and the other terminal may be grounded. The voltagedivider resistor R13_8 and the voltage divider resistor R4_8 may beconnected in series between the power supply voltage VCC and the ground.The connection point of the voltage divider resistor R13_8 and thevoltage divider resistor R4_8 may be connected is connected to pin 2 ofthe operation amplifier U1A_8. The power supply terminal and the groundterminal of the operation amplifier U1A_8 may be respectively connectedto the power supply voltage VCC and the ground. Two terminals of thefilter capacitor C22_8 may be respectively connected to the power supplyterminal of the operation amplifier U1A_8 and the ground. The voltagedivider resistor R15_8 and the filter capacitor C23_8 may be connectedin series between the power supply voltage VCC and the ground. Theconnection point where the voltage divider resistor R15_8 and the filtercapacitor C23_8 connect may be to pin 1 of the calculating amplifierU1A_8. Pin 1 of the calculating amplifier U1A_8 may be connected to acontrol signal input terminal pin 13 of the microcontroller MCU_8.

As shown in FIGS. 4, 6, and 8, the power supply filter circuit of thepower supply circuit 90 may comprise an inductor T3_4. The first filterand regulator circuit may comprise a current limiting resistor R5_4, afilter capacitor C18_4, and an internal regulator circuit of pin 6 ofthe leakage signal processing IC U5_8 (pin 16 of ICU 4_6). The inductorT3_4 may be connected between the input terminal of the live line L andpin 1 of the rectifier circuit U27_4. The two terminals of the currentlimiting resistor R5_4 may be respectively connected to an outputterminal pin 3 of the rectifier circuit U27_4 and pin 6 of the leakagesignal processing IC U5_8. Filter capacitor C18_4 may be connectedbetween pin 6 of the leakage signal processing IC U5_8 and the ground.

The second filter and regulator circuit may comprise a current limitingresistor R2_4, a stabilivolt DZ1_4, a filter capacitor C7_4, a filtercapacitor C6_5, a filter capacitor C13_5, a filter capacitor C74_5, apower supply ICU2_5, a filter capacitor C8_5, a filter capacitor C9_5, afilter capacitor C17_5, and a filter capacitor C10_5. One terminal ofthe current limiting resistor R2_4 may be connected to pin 3 of therectifier circuit U27_4, and the other terminal may be connected to pin2 of the power supply ICU2_5. The positive electrode of the stabilivoltDZ1_4 may be grounded; its negative electrode may be connected to pin 2of the power supply ICU2_5. Filter capacitor C6_5, filter capacitorC13_5, and filter capacitor C74_5 each may have one terminal grounded,and may have the other terminal connected to pin 2 of the power supplyICU2_5. Filter capacitor C8_5, the filter capacitor C9_5, the filtercapacitor C17_5, and the filter capacitor C10_5 each may have oneterminal grounded, and may have the other terminal connected to pin 3 ofthe power supply ICU2_5. Pin 3 of the power supply ICU2_5 may beconnected to the VCC terminal of the power supply grounding faultprotection circuit, and pin 1 may be grounded.

As shown in FIG. 4, in the present embodiment, the power supply circuit90 may be further provided with a piezoresistor RY1_4 and anover-current protection resistor F1_4. The piezoresistor RY1_4 may beconnected between an input terminal of the live line L and an inputterminal of the neutral line N. The over-current protection resistorF1_4 may be connected between the input terminal of the live line L andan input terminal of the power supply filter circuit.

In other embodiments, piezoresistor RY1_4 and/or the over-currentprotection resistor F1_4 may be omitted, and the objectives of thepresent disclosure may still be achieved.

As shown in FIG. 4, the leakage detection circuit of the leakagegrounding detection circuit 20 may comprise a current coupling inductioncoil T1_4 and a capacitor C6_4. The capacitor C6_4 may be connected tothe two terminals of the current coupling induction coil T1_4 to form afilter circuit. The filter circuit may be connected to pin 2 and pin 3of the leakage signal processing IC U5_8 of the signal amplifying andshaping circuit 10-2. The supply lines of the ground fault protectioncircuit may pass through the current coupling induction coil T1_4.

The grounding detection circuit of the leakage grounding detectioncircuit 20 may comprise a current coupling induction coil T2_4 and acapacitor C3_4. The capacitor C3_4 may be connected to the two terminalsof the current coupling induction coil T2_4 to form a filter circuit.One terminal of the filter circuit may be grounded, and the otherterminal may be connected, via the coupling capacitor C31_4 of theleakage detection signal amplifying circuit, to pin 7 of the leakagesignal processing IC U5_8 of the signal amplifying and shaping circuit(pin 17 of IC U4_6). The supply lines of the ground fault protectioncircuit may pass through the current coupling induction T2_4.

As shown in FIGS. 4, 6, and 8, the power supply detection circuit of thepower supply detection and indicator circuit 60 may comprise rectifiercircuit U27_4, current limiting resistor R5_4, an internal regulatorcircuit of pin 6 of the leakage signal processing IC U5_8 (pin 16 of ICU4_6), a filter capacitor C18_4, a voltage divider resistors R6_6, avoltage divider resistor R3_6, a filter capacitor C11_6, and themicrocontroller MCU_8. The two terminals of the current limitingresistor R5_4 may be respectively connected to the output terminal pin 3of the rectifier circuit U27_4 and pin 6 of the leakage signalprocessing IC U5_8. The filter capacitor C18_4 may be connected betweenpin 6 of the leakage signal processing IC U5_8 and the ground, oneterminal of the voltage divider resistor R6_6 may be connected to pin 6of the leakage signal processing IC U5_8, and the other terminal may beconnected in series to the voltage divider resistor R3_6, which may begrounded. The connection point of the voltage divider resistor R6_6 andthe voltage divider resistor R3_6 may be connected to a detectionterminal pin 6 of the microcontroller MCU_8 (pin 5 of IC U4_6). Oneterminal of the filter capacitor C11_6 may be grounded, and the otherterminal may be connected to the detection terminal pin 6 of themicrocontroller MCU_8.

The indicator circuit of the power supply detection and indicatorcircuit 60 may comprise a normal signal output terminal pin 5 and afault signal output terminal pin 2 of the microcontroller MCU_8 (pins 14and 13 of IC U4_6, respectively), a current limiting resistor R8_6, acurrent limiting resistor R11_6, and a red LED and green LED of LEDindicator D10_6. The current limiting resistor R8_6 may be connectedbetween the fault signal output terminal of the microcontroller MCU_8and the negative electrode of a red LED of LED indicator D10_6. Thecurrent limiting resistor R11_6 may be connected between the normalsignal output terminal of the microcontroller MCU_8 and the negativeelectrode of a green LED of LED indicator D10_6. The positive electrodeof the red LED and the positive electrode of the green LED may beconnected to VCC.

As shown in FIGS. 4, 6, and 8, the control circuit of the trippingmechanism control circuit 80 may comprise the microcontroller MCU_8, afilter capacitor C5_6, a current limiting resistor R7_6, a one-waysilicon controlled rectifier SCR1_4, one-way silicon controlledrectifier SCR4_4, a filter capacitor C12_4, a surge absorption resistorC21_4, and a relay T3_4 that interfaces with inductor coil T3_4. Thefilter capacitor C5_6 may be connected between a triggering signalterminal pin 3 of the MCU_8 (pin 7 of IC U4_6) and the ground. Currentlimiting resistor R7_6 may be connected between the triggering signalterminal pin 3 of the MCU_8 and the control electrodes of both one-waysilicon controlled rectifier SCR1_4 and one-way silicon controlledrectifier SCR4_4. The anodes of the one-way silicon controlled rectifierSCR1_4 and one-way silicon controlled rectifier SCR4_4 may be connectedto the connection point where the coil of the relay T3_4 is connected tothe AC input (pin 1) of the rectifier circuit U27_4. The cathodes or waysilicon controlled rectifier SCR1_4 and one-way silicon controlledrectifier SCR4_4 may be grounded. The surge absorption capacitor C12_4and the surge absorption resistor R21_4 may be connected in seriesbetween the anodes of the one-way silicon controlled rectifiers SCR1_4and SCR4_4 and the ground. Relay T3_4 may drive the reset switch intoaction through a mechanical link. In alternative embodiments, one of theone-way silicon controlled rectifiers SCR1_4, SCR4_4 may be omitted.

The manual detection circuit 40 may comprise a current limiting resistorR1_4 and a press switch S3_4. The current limiting resistor R1_4 and thepress switch S3_4 may be connected in series, with one terminal isconnected to the input terminal of the neutral line N of the groundfault protection circuit, and the other terminal connected to thereceptacle output of the live line.

In some embodiments, manual detection circuit 20 a may be omitted, andthe objectives of the present disclosure may still be achieved.

As shown in FIGS. 4, 6, and 8, the reverse connection detection controlcircuit of the reverse connection detection and execution circuit 70 maycomprise microcontroller MCU_8, a filter capacitor C15_6, a triggeringcurrent limiting resistor R10_6, a heavy and light current isolationoptocoupler U6_4, a triggering current limiting resistor R19_4, ananti-false-triggering current limiting resistor R20_4, and a two-waysilicon controlled rectifier SCR3_4. The filter capacitor C15_6 may beconnected between a SCR triggering terminal pin 8 of MCU_8 (pin 10 of ICU4_6) and the ground. The current limiting resistor R10_6 may beconnected between the SCR triggering terminal pin 8 of the MCU_8 and atriggering control terminal pin 2 of the heavy and light currentisolation optocoupler U6_4. A power supply terminal pin 1 of the heavyand light current isolation optocoupler U6_4 may be connected to the VCCterminal of the power supply grounding fault protection circuit. Oneterminal of the triggering current limiting resistor R19_4 may beconnected to a second T2 electrode of the two-way silicon controlledrectifier SCR3_4; the other terminal may be connected to the outputterminal L_load of the live line L. The anti-false-triggering currentlimiting resistor R20_4 may be connected between the control electrodeand a first T2 electrode of the two-way silicon controlled rectifierSCR3_4. The control electrode of the two-way silicon controlledrectifier SCR3_4 may be connected to a second output terminal of theheavy and light current isolation optocoupler U6_4. A first outputterminal of the heavy and light current isolation optocoupler U6_4 maybe connected to the output terminal of the output terminal L_load of thelive line L.

As shown in FIG. 4, the detection and execution circuit of the reverseconnection detection and execution circuit 70 may comprise a surgeabsorption capacitor C11_4, a surge absorption capacitor C13_4, anormally-closed contact K1_4, a normally-open contact K2_4, a surgeabsorption resistor R18_4, a normally-closed switch S2_4, and a reverserelay T4_4. In this disclosure, the terms normally-open andnormally-closed refer to the initial state of element in the GFCI, forexample the state of a new GFCI prior to installation. The surgeabsorption capacitor C11_4 and the surge absorption capacitor C13_4 maybe connected in series. One terminal of the surge absorption capacitorC13_4, along with the normally-closed contact K1_4 and the normally-opencontact K2_4 may be connected to a first output terminal of the heavyand light current isolation optocoupler U6_4. One terminal of the surgeabsorption capacitor C11_4, along with the other terminal of thenormally-closed contact K1_4 and the normally-open contact K2_4, may beconnected to a second terminal of the heavy and light current isolationoptocoupler U6_4 via the anti-false-triggering current limiting resistorR20_4. One terminal of the surge absorption resistor R18_4 may beconnected to the terminal of the surge absorption capacitor C11_4 thatis connected to the surge absorption capacitor C13_4; the other terminalof the surge absorption resistor R18_4 may be connected to the outputterminal N_load of the neutral line N. The normally-closed switch S2_4may be provided on live line L and the neutral line N, and may belocated between the output terminals L_load 4, N_load and the resetswitch S1_4. The normally-closed switch S2_4 may be linked with thenormally-open contact K2_4. The reverse relay T4_4 may have one terminalof its control terminals connected to the second output terminal of theheavy and light current isolation optocoupler U6_4 via theanti-false-triggering current limiting resistor R20_4, and may have itsother terminal connected to the output terminal N_load of the neutralline N. The reverse relay T4_4 may drive the normally-closed switchS2_4.

As shown in FIGS. 7 and 8, the wireless network circuit 40 may comprisea wireless network IC U52_7, a WIFI reset switch S2_7 (which may be usedto reset the WIFI module), wireless reset resistors R106_7 and R108_7, awireless reset filter resistor R104_7, a wireless reset filter capacitorC95_7, and a wireless enabling resistor R105_7. Wireless network ICU52_7 may be an IC of 18 pins with WIFI function.

One pin of the wireless reset filter resistor R104_7 may be grounded andthe other pin may be connected to pin 3 of the wireless network ICU52_7. One pin of the wireless reset filter capacitor C95_7 may begrounded, and the other pin may be connected to pin 16 of the wirelessnetwork IC U52_7. One pin of the wireless reset resistor R106_7 may beconnected to VCC of the power supply, and the other pin may be connectedto pin 16 of the wireless network ICU52_7. One pin of the wirelessenabling resistor R105_7 may be connected to VCC of the power supply,and he other pin may be connected to pin 9 of the wireless network ICU52_7. One pin of the wireless reset resistor R108_7 may be connected toVCC, and the other pin may be connected to pin 15 of the wirelessnetwork IC U52_7. One pin of the WIFI reset switch S2_7 may be grounded,and the other pin may be connected to pin 15 of the wireless network ICU52_7. Pin 2 of the wireless network IC U52_7 may be connected to pin 15of the microcontroller MCU_8 (pin 9 of IC U4_6). Pin 17 of the wirelessnetwork ICU52_7 may be connected to pin 14 of the microcontroller MCU_8(pin 8 of IC U4_6). Pin 15 of the wireless network ICU52_7 may beconnected to pin 13 of the microcontroller MCU_8 (pin 18 of IC U4_6).Pin 16 of the wireless network IC U52_7 may be connected to pin 12 ofthe microcontroller MCU_8 (pin 18 of IC U4_6).

As shown in FIGS. 4, 6, and 8, the automatic resetting circuit 30 maycomprise an automatic resetting iron core T5_4, a surge absorptionfilter capacitor C14_4, a surge absorption resistor R22_4, and anautomatic resetting driving circuit. The automatic resetting drivingcircuit may comprise a silicon controlled rectifier SCRS_4 and a drivingresistor R12_6. One terminal of the automatic resetting iron core T5_4may be connected to an over-current protection resistor F1_4 on theinput terminal of the live line L. Alternatively, automatic resettingiron core T5_4 may be connected directly connected to the input terminalof the live line L. The other terminal of automatic resetting iron coreT5_4 may be connected to pin 3 of the silicon controlled rectifierSCRS_4 through the surge absorption filter capacitor C14_4 and the surgeabsorption resistor R22_4, which may be connected in series. Pin 2 ofthe silicon controlled rectifier SCRS_4 may be connected to theautomatic resetting iron core T5_4, and pin 3 of the silicon controlledrectifier SCRS_4 may be grounded. One terminal of driving resistor R12_6may be connected to pin 9 of the MCU_8 of the microcontroller controlcircuit 10-1 (pin 11 of IC U4_6) and a filter capacitor C16_6; the otherterminal of driving resistor R12_6 may be connected to pin 1 of thesilicon controlled rectifier SCRS_4. One terminal of the filtercapacitor C16_6 may be grounded. The microcontroller control circuit10-1 may receive wireless control signal through the wireless networkcircuit 40, and may control the resetting iron core T5_4 through theautomatic resetting circuit 30, so as to carry out automatic resetting.

As shown in FIGS. 4, 6, and 8, the simulation leakage circuit 50 maycomprise microcontroller MCU_8, a filter capacitor C4_6, a currentlimiting resistor R9_6, a one-way silicon controlled rectifier SCR2_4,and a current limiting resistor R10_4. One terminal of the filtercapacitor C4_6 may be grounded, and the other terminal may be connectedto a simulation signal triggering terminal pin 7 of the microcontrollerMCU_8 (pin 15 of ICU4_6). One terminal of the current limiting resistorR9_6 may be connected to the simulation signal triggering terminal pin 7of the microcontroller MCU_8, and the other terminal may be connected tothe control electrode of the one-way silicon controlled rectifierSCR2_4. The one-way silicon controlled rectifier SCR2_4 and the limitingresistor R10_4 may be connected in series between the live line L andthe ground. The anode of the one-way silicon controlled rectifier SCR2_4may be connected to limiting resistor R10_4. The connection point wherelimiting resistor R10_4 may be connected to the live line L is locatedafter the position where the live line L of the municipal electricitypasses through current coupling induction coil T2_4 and is locatedbefore the reset switch S1_4.

In other embodiments, the simulation leakage circuit 50 may be omitted,and the objectives of the present disclosure may still be achieved.

A GFCI with the with the power supply grounding fault circuit of thepresent disclosure may work as follows:

Booting and power-on self-test: When powered on in a reset state (whenS1_4 is closed), U4_6 provides a self-test to check functionality.Specifically, U4_6 conducts a two step power-on self-test when itreceives a normal power supply at pin 20, a normal reset signal at pin6, and a normal power supply detection signal at pin 6. If pin 6 of U4_6is not able to detect a normal power supply detection signal, U4_6 willdirectly output low voltage at pin 13, which powers the red LED toremind the user of the failure of the GFCI and the need of replacement.

The first step of the self-test is automatic reverse connectiondetection. Upon booting up, pin 10 of U4_6 first will output a lowvoltage reverse connection automatic detection driving signal forapproximately 15 ms, which renders optocoupler U6_4 conductive throughC15_6 and R10_6. In turn, this triggers the two-way silicon controlledrectifier SCR3_4 into a conductive state. Then, reverse relay T4_4 isenergized through a path from L_load and SCR3_4 to N_load, therebydisconnecting the normally-closed contact S2_4. As a result, L_load andN_load are instantly disconnected from the AC input L and N,de-energizing T4_4, closing opened normally-closed contact S2_4, andenergizing L_load and N_load, which supply power to the load and T4_4,repeating the cycle. After approximately 15 ms, the low voltage reverseconnection automatic detection driving signal ceases, U6_4 no longerconducts and SCR3_4 is completely disconnected, deenergizing T4_4,closing S2_4, and assuring normal power supply for the load throughL_load and N_load. Typically, 1-3 cycles of opening and closing S2_4 dueto energizing and de-energizing may occur in 15 ms.

In the case of reverse connection (e.g., if the municipal electricity isconnected to the load output terminals of L_load and N_load rather thaninput terminals of L/N), the energizing of reverse relay T4_4 will closethe normally-open contact K2_4 of T4_4. Thus, the reversely connectedmunicipal power supply will supply power to T4_3 through L_load andN_load and K2_4, even after the low voltage reverse connection automaticdetection driving signal ceases. T4_4 will remain electrically pulledin, keeping contact K2_4 closed, disconnecting input terminals L/N andpower socket L1/N1 from L_load and N_load, and assuring safety of users.

In the second step of the power-on self-test, U4_5 conducts a bootingleakage self-test. Pin 16 of U4_5 outputs high voltage for 50 ms, which,after current limiting by R9_6, drives the silicon controlled rectifierSCR2_4 into a conductive state, and simulates leakage from live line Lto the ground through R10_4. In a normal working case, U4_6 will receivea high voltage control signal at an internal register, based on aleakage signal from leaking grounding detection circuit 20. Then, pin 13of U4_6 will output a low voltage signal, which powers on the green LED,indicating that the circuit is working properly. However, the highvoltage control signal is not received at the internal register, itmeans that there is an abnormality in the leakage grounding detectioncircuit; pin 14 of U4_6 outputs high voltage, and pin 13 outputs lowvoltage, powering on the red LED to indicate that the circuit has failedand remind users to replace it.

Tripped state automatic reverse connection protection: When in a trippedstate, the self-test protection function is as follows. In a trippedstate, S1_4 is disconnected and K1_4 is closed. Relay T4_4 is directlyconnected to L_Load via K1_4 and is energized and pulled in, openingnormally-closed contact S2_4 and closing normally-open contact K2_4. Theopening of S2_4 disconnects input terminals L/N and L1/N1 fromL_Load/N_load, assuring safety of users. As long as the reverseconnection exists, relay T4_4 remains self-locked and remains poweredvia K1_4. The perpetual self-locking state, where the socket and L/N ofthe grounding fault interrupter are not powered, reminds users of theconnection error and the need to re-install.

Leakage and abnormal grounding protection: When working properly, thecircuit will detect leakage or abnormal grounding, and enter thetripping state as follows. Leakage or abnormal grounding will result inabnormal signals through T1_4 and T2_4, which are filtered through C6_4and C3_4, respectively. After traveling through C30_4 and C31_4,respectively, the signals enter pins 1 and 7 of U4_6, respectively. Ifit detects a high voltage signal ICU4_6 will output a high voltagesignal of 25ms at its pin 7 (pin 3 of MUC_8), which, after filteringthrough C5_6 and current limiting by R7_6, triggers the siliconcontrolled rectifier SCR1_4 into a conductive state. Then, a largecurrent instantly passes through the relay T3_3 to drive the trippingmechanism to be tripped, opening reset button S1_3, disconnecting theload circuit and socket from the power supply, and protecting thecircuit and safety of users.

Wireless signal controlling: A wireless signal may be received bywireless network circuit 40, and transformed into digital signal in awireless module. Pin 2 of Wireless network IC may U52_7 may communicatewith U4_6/MCU_8 via a serial communication circuit for by pins 2 and 19of U52_7, for sending and receiving signal signals respectively, andpins 9 and 8 of U4_6 (pins 15 and 14 of MCU_8) for receiving and sendingrespectively. Thus, the transformed signal may be delivered, via theserial communication circuit, to the microcontroller for processing andcontrolling. When appropriate, the iron core may be driven toautomatically reset the GFCI by a signal sent on pin 11 of ICU4_6 (pin 9of MCU_8) that places SCRS_4 into a conductive state.

Regular cyclic self-test: After a power-on self-test, U4_6 may be set(by the program) to periodically conduct a self-test, for example every150 minutes. The principle for the self-test is identical to that forthe leakage self-test of the second step of the power-on self-test ofU4_6.

In the preceding specification, various preferred embodiments have beendescribed with reference to the accompanying drawings. It will, however,be evident that various other modifications and changes may be madethereto, and additional embodiments may also be implemented, withoutdeparting from the broader scope of the invention as set forth in theclaims that follow.

Other embodiments of the invention will be apparent to those skilled inthe art from consideration of the specification and practice of theinvention disclosed herein. It is intended that the specification andexamples be considered as exemplary only, with the true scope and spiritof the invention being indicated by the following claims.

1-20. (canceled)
 21. A power supply grounding fault protection circuit,comprising: a power supply circuit; a leakage grounding detectioncircuit; a signal amplifying and shaping circuit; a microcontrollercontrol circuit; a power supply detection and indicator circuit; atripping mechanism control circuit; a reverse grounding detection andexecution circuit; a wireless network circuit; and an automaticresetting circuit, wherein: the leakage grounding detection circuitcomprises a leakage detection circuit and a grounding detection circuit,which detect leakage failure and grounding failure, respectively; thesignal amplifying and shaping circuit comprises a leakage detectionsignal amplifying circuit and a signal shaping circuit, which areconnected to each other and carry out amplifying and shaping on aleakage detection signal; the microcontroller control circuit carriesout power-on self-test and reset for the power supply grounding faultprotection circuit; the power supply detection and indicator circuitcomprises a power supply detection circuit and an indicator circuit,which are connected to each other and carry out detection and displayingof a power status; the tripping mechanism control circuit comprises areset switch, which is provided on a live line and a neutral line of theground fault protection circuit, and a control circuit that controls thereset switch; the reverse grounding detection and execution circuitcomprises a reverse connection detection control circuit and a detectionand execution circuit, which are connected to each other and carry outdetecting of a reverse connection of the ground fault protection circuitin a reset state and in a tripped state; the wireless network circuitcarries out sending and receiving of wireless signals of the powersupply grounding fault protection circuit and is respectively connectedto the power supply circuit and the microcontroller control circuit; theautomatic resetting circuit is connected to the microcontroller controlcircuit and carries out controlling and driving of resetting actions ofthe reset switch of the tripping mechanism control circuit; the powersupply circuit comprises a power supply filter circuit, a firstrectifier circuit, a first filter and regulator circuit, and a secondfilter and regulator circuit; the first filter and regulator circuit isconnected to the leakage grounding detection circuit; the second filterand regulator circuit is connected to the signal amplifying and shapingcircuit and the microcontroller control circuit; the leakage groundingdetection circuit, the signal amplifying and shaping circuit, and themicrocontroller control circuit are connected in sequence; themicrocontroller control circuit is connected to the power supplydetection and indicator circuit, the tripping mechanism control circuit,and the reverse connection detection and execution circuit; the powersupply filter circuit is connected to an input terminal of the liveline; a first input terminal and a second input terminal of the firstrectifier circuit are respectively connected to an input terminal of theneutral line and an output terminal of the power supply filter circuit;the first rectifier circuit is grounded; the first rectifier circuit isconnected to the both the first filter and regulator circuit and thesecond filter and regulator circuit; the reset switch is positioned onthe live line and the neutral line after the grounding detectioncircuit; the microcontroller control circuit comprises amicrocontroller, a first capacitor, and a reset filter circuit; thereset filter circuit comprises a reset IC and a second capacitor; thereset IC is connected to a VCC of the ground fault protection circuit, areset terminal of the microcontroller, and a ground; the secondcapacitor is connected to the reset IC; the first capacitor is connectedbetween a power supply terminal of the microcontroller and a ground; thepower supply terminal of the microcontroller is connected to the VCC; aground terminal of the microcontroller is grounded; the leakagedetection signal amplifying circuit comprises a leakage signalprocessing IC, a third capacitor, a first resistor, and a fourthcapacitor; the first resistor and the fourth capacitor are connected inseries between the leakage detection circuit and the grounding detectioncircuit; the signal shaping circuit comprises an operation amplifier, afifth capacitor, a sixth capacitor, a seventh capacitor, a secondresistor, a third resistor, a fourth resistor, an eighth capacitor, aninth capacitor, a tenth capacitor, and a fifth resistor; the third andfourth resistors are connected in series between the VCC and the ground;a power supply terminal and a ground terminal of the operation amplifierare respectively connected to the VCC and the ground; the ninthcapacitor is connected between the power supply terminal of theoperation amplifier and the ground; and the fifth resistor and the tenthcapacitor are disposed in series between the VCC and the ground.
 22. Thepower supply grounding fault protection circuit of claim 21, wherein thesignal shaping circuit, the leakage signal processing IC, and themicrocontroller of the microcontroller circuit are contained within asingle microcontroller control signal amplifying and shaping circuitchip.
 23. A power supply grounding fault protection circuit, comprising:a power supply circuit; a leakage grounding detection circuit; a signalamplifying and shaping circuit; a microcontroller control circuit; apower supply detection and indicator circuit; a tripping mechanismcontrol circuit; a reverse grounding detection and execution circuit; awireless network circuit; and an automatic resetting circuit, wherein:the wireless network circuit comprises a wireless network IC, a WIFIreset switch, a first wireless reset resistor, a second wireless resetresistor, a wireless reset filter resistor, a wireless reset filtercapacitor, and a wireless enabling resistor; and the wireless network IChas WIFI functionality.
 24. The power supply grounding fault protectioncircuit of claim 23, wherein: the leakage grounding detection circuitcomprises a leakage detection circuit and a grounding detection circuit,which detect leakage failure and grounding failure, respectively; thesignal amplifying and shaping circuit comprises a leakage detectionsignal amplifying circuit and a signal shaping circuit, which areconnected to each other and carry out amplifying and shaping on aleakage detection signal; the microcontroller control circuit carriesout power-on self-test and reset for the power supply grounding faultprotection circuit; the power supply detection and indicator circuitcomprises a power supply detection circuit and an indicator circuit,which are connected to each other and carry out detection and displayingof a power status; the tripping mechanism control circuit comprises areset switch, which is provided on a live line and a neutral line of theground fault protection circuit, and a control circuit that controls thereset switch; the reverse grounding detection and execution circuitcomprises a reverse connection detection control circuit and a detectionand execution circuit, which are connected to each other and carry outdetecting of a reverse connection of the ground fault protection circuitin a reset state and in a tripped state; the wireless network circuitcarries out sending and receiving of wireless signals of the powersupply grounding fault protection circuit and is respectively connectedto the power supply circuit and the microcontroller control circuit; andthe automatic resetting circuit is connected to the microcontrollercontrol circuit and carries out controlling and driving of resettingactions of the reset switch of the tripping mechanism control circuit.25. The power supply grounding fault protection circuit of claim 24,wherein: the power supply circuit comprises a power supply filtercircuit, a first rectifier circuit, a first filter and regulatorcircuit, and a second filter and regulator circuit; the first filter andregulator circuit is connected to the leakage grounding detectioncircuit; the second filter and regulator circuit is connected to thesignal amplifying and shaping circuit and the microcontroller controlcircuit; the leakage grounding detection circuit, the signal amplifyingand shaping circuit, and the microcontroller control circuit areconnected in sequence; and the microcontroller control circuit isconnected to the power supply detection and indicator circuit, thetripping mechanism control circuit, and the reverse connection detectionand execution circuit.
 26. The power supply grounding fault protectioncircuit of claim 25, wherein: the power supply filter circuit isconnected to an input terminal of the live line; a first input terminaland a second input terminal of the first rectifier circuit arerespectively connected to an input terminal of the neutral line and anoutput terminal of the power supply filter circuit; the first rectifiercircuit is grounded; the first rectifier circuit is connected to theboth the first filter and regulator circuit and the second filter andregulator circuit; and the reset switch is positioned on the live lineand the neutral line after the grounding detection circuit
 27. A powersupply grounding fault protection circuit, comprising: a power supplycircuit; a leakage grounding detection circuit; a signal amplifying andshaping circuit; a microcontroller control circuit; a power supplydetection and indicator circuit; a tripping mechanism control circuit; areverse grounding detection and execution circuit; a wireless networkcircuit; and an automatic resetting circuit, wherein: the automaticresetting circuit comprises an automatic resetting iron core, a surgeabsorption filter capacitor, a surge absorption resistor, and anautomatic resetting driving circuit; the automatic resetting drivingcircuit comprises a silicon controlled rectifier and a driving resistor;a first terminal of the automatic resetting iron core is connected to aninput terminal of a live line of the power supply grounding faultprotection circuit; the surge absorption filter capacitor and the surgeadsorption resistor are connected; and the microcontroller controlcircuit is configured to carry out automatic resetting by receivingwireless control signals through the wireless network circuit and bycontrolling the resetting iron core through the automatic resettingcircuit.
 28. The power supply grounding fault protection circuit ofclaim 27, wherein: the leakage grounding detection circuit comprises aleakage detection circuit and a grounding detection circuit, whichdetect leakage failure and grounding failure, respectively; the signalamplifying and shaping circuit comprises a leakage detection signalamplifying circuit and a signal shaping circuit, which are connected toeach other and carry out amplifying and shaping on a leakage detectionsignal; the microcontroller control circuit carries out power-onself-test and reset for the power supply grounding fault protectioncircuit; the power supply detection and indicator circuit comprises apower supply detection circuit and an indicator circuit, which areconnected to each other and carry out detection and displaying of apower status; the tripping mechanism control circuit comprises a resetswitch, which is provided on a live line and a neutral line of theground fault protection circuit, and a control circuit that controls thereset switch; the reverse grounding detection and execution circuitcomprises a reverse connection detection control circuit and a detectionand execution circuit, which are connected to each other and carry outdetecting of a reverse connection of the ground fault protection circuitin a reset state and in a tripped state; the wireless network circuitcarries out sending and receiving of wireless signals of the powersupply grounding fault protection circuit and is respectively connectedto the power supply circuit and the microcontroller control circuit; andthe automatic resetting circuit is connected to the microcontrollercontrol circuit and carries out controlling and driving of resettingactions of the reset switch of the tripping mechanism control circuit.29. The power supply grounding fault protection circuit of claim 28,wherein: the power supply circuit comprises a power supply filtercircuit, a first rectifier circuit, a first filter and regulatorcircuit, and a second filter and regulator circuit; the first filter andregulator circuit is connected to the leakage grounding detectioncircuit; the second filter and regulator circuit is connected to thesignal amplifying and shaping circuit and the microcontroller controlcircuit; the leakage grounding detection circuit, the signal amplifyingand shaping circuit, and the microcontroller control circuit areconnected in sequence; and the microcontroller control circuit isconnected to the power supply detection and indicator circuit, thetripping mechanism control circuit, and the reverse connection detectionand execution circuit.
 30. The power supply grounding fault protectioncircuit of claim 29, wherein: the power supply filter circuit isconnected to an input terminal of the live line; a first input terminaland a second input terminal of the first rectifier circuit arerespectively connected to an input terminal of the neutral line and anoutput terminal of the power supply filter circuit; the first rectifiercircuit is grounded; the first rectifier circuit is connected to theboth the first filter and regulator circuit and the second filter andregulator circuit; and the reset switch is positioned on the live lineand the neutral line after the grounding detection circuit.
 31. Thepower supply grounding fault protection circuit of claim 22, furthercomprising a simulation leakage circuit connected to the microcontrollercontrol circuit and the leakage grounding detection circuit.
 32. Thepower supply grounding fault protection circuit of claim 24, furthercomprising a simulation leakage circuit connected to the microcontrollercontrol circuit and the leakage grounding detection circuit.
 33. Thepower supply grounding fault protection circuit of claim 21, furthercomprising a simulation leakage circuit connected to the microcontrollercontrol circuit and the leakage grounding detection circuit.
 34. Thepower supply grounding fault protection circuit of claim 21, wherein:the wireless network circuit comprises a wireless network IC, a WIFIreset switch, a first wireless reset resistor, a second wireless resetresistor, a wireless reset filter resistor, a wireless reset filtercapacitor, and a wireless enabling resistor; and the wireless network IChas WIFI functionality.
 35. The power supply grounding fault protectioncircuit of claim 27, further comprising a simulation leakage circuitconnected to the microcontroller control circuit and the leakagegrounding detection circuit.
 36. The power supply grounding faultprotection circuit of claim 28, further comprising a simulation leakagecircuit connected to the microcontroller control circuit and the leakagegrounding detection circuit.
 37. The power supply grounding faultprotection circuit of claim 23, wherein: the wireless reset filterresistor is connected between ground and a the wireless network IC; thewireless reset filter capacitor is connected between ground and thewireless network IC; the first wireless reset resistor is connectedbetween a VCC of the ground fault protection circuit and the wirelessnetwork IC; the wireless enabling resistor is connected between the VCCand the wireless network IC; the second wireless reset resistor isconnected between the VCC and the wireless network IC; the WIFI resetswitch is connected between the ground and the wireless network IC; thewireless network IC is connected to a microcontroller of themicrocontroller control circuit; and the wireless network IC isconnected to the microcontroller.
 38. The power supply grounding faultprotection circuit of claim 21, wherein: the automatic resetting circuitcomprises an automatic resetting iron core, a surge absorption filtercapacitor, a surge absorption resistor, and an automatic resettingdriving circuit; the automatic resetting driving circuit comprises asilicon controlled rectifier and a driving resistor; a first terminal ofthe automatic resetting iron core is connected to an input terminal of alive line of the power supply grounding fault protection circuit; asecond terminal of the automatic resetting iron core is connected to thesilicon controlled rectifier through the surge absorption filtercapacitor and the surge adsorption resistor, which are connected inseries; the silicon controlled rectifier is connected to the automaticresetting iron core; the silicon controlled rectifier is grounded; thedriving resistor is connected a microcontroller of the microcontrollercontrol circuit and the silicon controlled rectifier; themicrocontroller is grounded via a filter capacitor; and themicrocontroller control circuit is configured to carry out automaticresetting by receiving wireless control signals through the wirelessnetwork circuit and by controlling the resetting iron core through theautomatic resetting circuit.
 39. The power supply grounding faultprotection circuit of claim 23, wherein: the automatic resetting circuitcomprises an automatic resetting iron core, a surge absorption filtercapacitor, a surge absorption resistor, and an automatic resettingdriving circuit; the automatic resetting driving circuit comprises asilicon controlled rectifier and a driving resistor; a first terminal ofthe automatic resetting iron core is connected to an input terminal of alive line of the power supply grounding fault protection circuit; asecond terminal of the automatic resetting iron core is connected to thesilicon controlled rectifier through the surge absorption filtercapacitor and the surge adsorption resistor, which are connected inseries; the silicon controlled rectifier is connected to the automaticresetting iron core; the silicon controlled rectifier is grounded; thedriving resistor is connected to a microcontroller of themicrocontroller control circuit and the silicon controlled rectifier;the microcontroller is grounded via a filter capacitor; and themicrocontroller control circuit is configured to carry out automaticresetting by receiving wireless control signals through the wirelessnetwork circuit and by controlling the resetting iron core through theautomatic resetting circuit.
 40. The power supply grounding faultprotection circuit of claim 27, wherein: the wireless network circuitcomprises a wireless network IC, a WIFI reset switch, a first wirelessreset resistor, a second wireless reset resistor, a wireless resetfilter resistor, a wireless reset filter capacitor, and a wirelessenabling resistor; and the wireless network IC has WIFI functionality.